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lavf: allow custom IO for all files

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Some (de)muxers open additional files beyond the main IO context.
Currently, they call avio_open() directly, which prevents the caller
from using custom IO for such streams.

This commit adds callbacks to AVFormatContext that default to
avio_open2()/avio_close(), but can be overridden by the caller. All
muxers and demuxers using AVIO are switched to using those callbacks
instead of calling avio_open()/avio_close() directly.

(de)muxers that use the URLProtocol layer directly instead of AVIO
remain unconverted for now. This should be fixed in later commits.
This commit is contained in:
Anton Khirnov
2016-01-16 17:53:43 +01:00
parent 68395f8c99
commit 9f61abc811
15 changed files with 130 additions and 68 deletions
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10
libavformat/mov.c
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@@ -2400,8 +2400,8 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
}
}
static int mov_open_dref(AVIOContext **pb, char *src, MOVDref *ref,
AVIOInterruptCB *int_cb)
static int mov_open_dref(AVFormatContext *s, AVIOContext **pb, char *src,
MOVDref *ref)
{
/* try relative path, we do not try the absolute because it can leak information about our
system to an attacker */
@@ -2436,7 +2436,7 @@ static int mov_open_dref(AVIOContext **pb, char *src, MOVDref *ref,
av_strlcat(filename, ref->path + l + 1, 1024);
if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))
if (!s->io_open(s, pb, filename, AVIO_FLAG_READ, NULL))
return 0;
}
}
@@ -2485,7 +2485,7 @@ static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {
MOVDref *dref = &sc->drefs[sc->dref_id - 1];
if (c->enable_drefs) {
if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback) < 0)
if (mov_open_dref(c->fc, &sc->pb, c->fc->filename, dref) < 0)
av_log(c->fc, AV_LOG_ERROR,
"stream %d, error opening alias: path='%s', dir='%s', "
"filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",
@@ -3335,7 +3335,7 @@ static int mov_read_close(AVFormatContext *s)
}
av_freep(&sc->drefs);
if (sc->pb && sc->pb != s->pb)
avio_close(sc->pb);
ff_format_io_close(s, &sc->pb);
av_freep(&sc->chunk_offsets);
av_freep(&sc->stsc_data);